Add icon rendering and list scroll gesture support

Implement orientation-aware icon rendering using freeink::Icon format that applies rotation transforms per-pixel. Add wasListScroll helper for touch-based list navigation with swipe gestures. Switch vertical centering from x-height to cap-height for better visual alignment with capital-led UI labels.

src/activities/home/FileBrowserActivity.cpp

@@ -206,6 +206,14 @@ void FileBrowserActivity::loop() {
   const int pathReserved = renderer.getLineHeight(SMALL_FONT_ID) + UITheme::getInstance().getMetrics().verticalSpacing;
   const int pageItems = UITheme::getNumberOfItemsPerPage(renderer, true, false, true, false, pathReserved);
 
+  // Vertical swipe page-scrolls the list (touch nav without the side buttons).
+  int scrollIdx = static_cast<int>(selectorIndex);
+  if (mappedInput.wasListScroll(scrollIdx, static_cast<int>(files.size()), pageItems)) {
+    selectorIndex = scrollIdx;
+    requestUpdate();
+    return;
+  }
+
   // Touch-down moves the selector to the pressed entry (shows selected state); release
   // opens it below.
   int downId = -1;

src/activities/home/RecentBooksActivity.cpp

@@ -44,6 +44,14 @@ void RecentBooksActivity::onExit() {
 void RecentBooksActivity::loop() {
   const int pageItems = UITheme::getInstance().getNumberOfItemsPerPage(renderer, true, false, true, true);
 
+  // Vertical swipe page-scrolls the list (touch nav without the side buttons).
+  int scrollIdx = static_cast<int>(selectorIndex);
+  if (mappedInput.wasListScroll(scrollIdx, static_cast<int>(recentBooks.size()), pageItems)) {
+    selectorIndex = scrollIdx;
+    requestUpdate();
+    return;
+  }
+
   // After a long-press has fired, swallow input until Confirm is physically released
   // (so the release doesn't also open the book; re-arm only once the button is up).
   if (longPressFired) {

src/activities/network/WifiSelectionActivity.cpp

@@ -409,6 +409,14 @@ void WifiSelectionActivity::loop() {
 
   // Handle network list state
   if (state == WifiSelectionState::NETWORK_LIST) {
+    // Vertical swipe page-scrolls the network list (touch nav without the side buttons).
+    int scrollIdx = static_cast<int>(selectedNetworkIndex);
+    if (mappedInput.wasListScroll(scrollIdx, static_cast<int>(networks.size()),
+                                  UITheme::getInstance().getNumberOfItemsPerPage(renderer, true, false, true, false))) {
+      selectedNetworkIndex = scrollIdx;
+      requestUpdate();
+      return;
+    }
     // Touch: down-select highlights the pressed network, tap selects it (like Confirm).
     int downId = -1;
     if (mappedInput.wasItemTouchedDown(downId) && downId >= 0 && downId < static_cast<int>(networks.size())) {

src/activities/reader/EpubReaderBookmarksActivity.cpp

@@ -104,6 +104,12 @@ void EpubReaderBookmarksActivity::loop() {
   }
 
   if (confirmingDelete < DELETE_MODE_DISPLAY) {
+    // Vertical swipe page-scrolls the list (touch nav without the side buttons).
+    const int pageItems = GUI.getListPageItems(getListHeight(renderer), true);
+    if (mappedInput.wasListScroll(selectorIndex, static_cast<int>(bookmarks.size()), pageItems)) {
+      requestUpdate();
+      return;
+    }
     int downId = -1;
     if (mappedInput.wasItemTouchedDown(downId) && downId >= 0 && downId < static_cast<int>(bookmarks.size())) {
       selectorIndex = downId;

src/activities/reader/EpubReaderChapterSelectionActivity.cpp

@@ -31,6 +31,12 @@ void EpubReaderChapterSelectionActivity::loop() {
   const int pageItems = UITheme::getInstance().getNumberOfItemsPerPage(renderer, true, false, true, false);
   const int totalItems = getTotalItems();
 
+  // Vertical swipe page-scrolls the list (touch nav without the side buttons).
+  if (mappedInput.wasListScroll(selectorIndex, totalItems, pageItems)) {
+    requestUpdate();
+    return;
+  }
+
   int downId = -1;
   if (mappedInput.wasItemTouchedDown(downId) && downId >= 0 && downId < totalItems) {
     selectorIndex = downId;

src/activities/reader/EpubReaderMenuActivity.cpp

@@ -57,6 +57,13 @@ void EpubReaderMenuActivity::loop() {
     requestUpdate();
   });
 
+  // Vertical swipe page-scrolls the menu (touch nav without the side buttons).
+  if (mappedInput.wasListScroll(selectedIndex, static_cast<int>(menuItems.size()),
+                                UITheme::getInstance().getNumberOfItemsPerPage(renderer, true, false, true, false))) {
+    requestUpdate();
+    return;
+  }
+
   // Touch-down moves the selection to the pressed item (shows selected state), like
   // moving with Up/Down; release activates it below.
   int downId = -1;

src/activities/settings/FontDownloadActivity.cpp

@@ -431,6 +431,11 @@ void FontDownloadActivity::loop() {
 
     const int listSize = listItemCount();
     const int pageItems = UITheme::getNumberOfItemsPerPage(renderer, true, false, true, false);
+    // Vertical swipe page-scrolls the list (touch nav without the side buttons).
+    if (mappedInput.wasListScroll(selectedIndex_, listSize, pageItems)) {
+      requestUpdate();
+      return;
+    }
 
     buttonNavigator_.onNextRelease([this, listSize] {
       selectedIndex_ = ButtonNavigator::nextIndex(selectedIndex_, listSize);

src/activities/settings/FontSelectionActivity.cpp

@@ -54,6 +54,14 @@ void FontSelectionActivity::loop() {
     return;
   }
 
+  const int listSize = static_cast<int>(fonts_.size());
+  const int pageItems = UITheme::getNumberOfItemsPerPage(renderer, true, false, true, false);
+  // Vertical swipe page-scrolls the list (touch nav without the side buttons).
+  if (mappedInput.wasListScroll(selectedIndex_, listSize, pageItems)) {
+    requestUpdate();
+    return;
+  }
+
   int downId = -1;
   if (mappedInput.wasItemTouchedDown(downId) && downId >= 0) {
     selectedIndex_ = downId;
@@ -72,9 +80,6 @@ void FontSelectionActivity::loop() {
     return;
   }
 
-  const int listSize = static_cast<int>(fonts_.size());
-  const int pageItems = UITheme::getNumberOfItemsPerPage(renderer, true, false, true, false);
-
   buttonNavigator_.onNextRelease([this, listSize] {
     selectedIndex_ = ButtonNavigator::nextIndex(selectedIndex_, listSize);
     requestUpdate();

src/activities/settings/LanguageSelectActivity.cpp

@@ -32,6 +32,13 @@ void LanguageSelectActivity::loop() {
     return;
   }
 
+  const int pageItems = UITheme::getNumberOfItemsPerPage(renderer, true, false, true, false);
+  // Vertical swipe page-scrolls the list (touch nav without the side buttons).
+  if (mappedInput.wasListScroll(selectedIndex, totalItems, pageItems)) {
+    requestUpdate();
+    return;
+  }
+
   int downId = -1;
   if (mappedInput.wasItemTouchedDown(downId) && downId >= 0) {
     selectedIndex = downId;
@@ -50,8 +57,6 @@ void LanguageSelectActivity::loop() {
     return;
   }
 
-  const int pageItems = UITheme::getNumberOfItemsPerPage(renderer, true, false, true, false);
-
   // Handle navigation
   buttonNavigator.onNextRelease([this] {
     selectedIndex = ButtonNavigator::nextIndex(static_cast<int>(selectedIndex), totalItems);

src/activities/settings/OpdsServerListActivity.cpp

@@ -41,6 +41,13 @@ void OpdsServerListActivity::loop() {
     return;
   }
 
+  // Vertical swipe page-scrolls the list (touch nav without the side buttons).
+  if (mappedInput.wasListScroll(selectedIndex, getItemCount(),
+                                UITheme::getInstance().getNumberOfItemsPerPage(renderer, true, false, true, false))) {
+    requestUpdate();
+    return;
+  }
+
   int downId = -1;
   if (mappedInput.wasItemTouchedDown(downId) && downId >= 0) {
     selectedIndex = downId;

src/activities/settings/SettingsActivity.cpp

@@ -130,6 +130,17 @@ void SettingsActivity::loop() {
     selectedSettingIndex = 0;
     hasChangedCategory = true;
     requestUpdate();
+  } else if (swipe == MappedInputManager::SwipeDir::Up || swipe == MappedInputManager::SwipeDir::Down) {
+    // Vertical swipe scrolls the settings list a page at a time (touch navigation
+    // without the side buttons). Swipe up moves down the list, and vice versa.
+    const int page = std::max(
+        1, UITheme::getNumberOfItemsPerPage(renderer, true, true, BaseTheme::showButtonHints(), false));
+    if (swipe == MappedInputManager::SwipeDir::Up) {
+      selectedSettingIndex = std::min(selectedSettingIndex + page, settingsCount);
+    } else {
+      selectedSettingIndex = std::max(selectedSettingIndex - page, 0);
+    }
+    requestUpdate();
   }
 
   // Tap a settings row to select + activate it. Row 0 is the tab bar, so the list